TY  - RPRT
TI  - USGS Branch of Geochemistry, sample submittal manual, fourth edition
AU  - C.M. Murphy
AU  - R.V. Mendes
AU  - S.T. Smith
PY  - 1993
DO  - 10.3133/ofr93533
UR  - https://pubs.usgs.gov/publication/ofr93533
ID  - ofr93533
ER  -